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This week: PS #1 due today at beginning of class

This week: PS #1 due today at beginning of class PS #2 is on the website, due next Tuesday (use student account to print) www.geology.cwu.edu /facstaff/huerta/g360/ Reading: ch . 4- Strain (not 4.8) and Ch 5- Rheology of va n der Pluijm Lab #3: Outcrop patterns, Ch 2 of RD&S.

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This week: PS #1 due today at beginning of class

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  1. This week: PS #1 due today at beginning of class PS #2 is on the website, due next Tuesday (use student account to print)www.geology.cwu.edu/facstaff/huerta/g360/ Reading:ch. 4- Strain (not 4.8) and Ch 5- Rheology of van der Pluijm Lab #3: Outcrop patterns, Ch 2 of RD&S

  2. Terminology clarification: Differential stress: difference between maximum and minimum stress: = s1 –s3 Deviatoric stress: difference between mean stress and maximum stress (or minimum stress), which is the radius of the Mohr Circle: =(s1-s3)/2 (See deveitis) These equations hold for systems where we only deal with s1and s3. This works in most real life cases, when the value of s2 does not affect the shear and normal stresses acting on faults and fractures.

  3. Dilation

  4. Principal Strain Axes y x

  5. Finite strain vs. incremental strain

  6. Coaxial strain Incremental principal strain axes are the same throughout strain history

  7. Non-coaxial strain Incremental principal strain axes rotate throughout strain history

  8. Quantifying strain • Longitudinal • Volumetric • Angular

  9. Strain States • General strain • Axially symmetric extension • Axially symmetric shortening • Plane strain • Simple shortening

  10. Strain on the map

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